Sand-Carrying Law and Influencing Factors in Complex Fractures of Nano-Clean Fracturing Fluid

Nano-clean fracturing fluids have broad application potential in coalbed methane reservoir owing to their high stability, good temperature resistance, low filtration loss, and strong frictional resistance reduction. However, the sand-carrying regularity of nano-clean reservoirs is unclear, especially for complex fractures with variable directions. This study established a sand transport model that considers proppant collision, wall friction blocking, fracture fluid branching angle law its influencing factors fractures. The degrees influence on equilibrium height placement rate from were particle size, density, properties, ratio, pumping discharge volume, correlation obtained by grey analysis are 0.862, 0.861, 0.855, 0.854, 0.832, respectively. As complexity deepens increases, flow reduced, making it difficult enter joints. performance better than common clear-water fluid. fluid-structure coupling can accurately characterize fluids, providing research basis optimizing efficiency parameters construction.